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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: SimpleFunction.html 939 2015-05-29 01:16:17Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.parse.func;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import org.jsimpledb.parse.ParseContext;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import org.jsimpledb.parse.ParseSession;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import org.jsimpledb.parse.expr.Node;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import org.jsimpledb.parse.expr.Value;<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>/**<a name="line.15"></a>
<span class="sourceLineNo">016</span> * Simplified {@link Function} implementation for when the parameters are all normal expressions.<a name="line.16"></a>
<span class="sourceLineNo">017</span> */<a name="line.17"></a>
<span class="sourceLineNo">018</span>public abstract class SimpleFunction extends AbstractFunction {<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>    protected final int minArgs;<a name="line.20"></a>
<span class="sourceLineNo">021</span>    protected final int maxArgs;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>// Constructors<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>    /**<a name="line.25"></a>
<span class="sourceLineNo">026</span>     * Constructor.<a name="line.26"></a>
<span class="sourceLineNo">027</span>     *<a name="line.27"></a>
<span class="sourceLineNo">028</span>     * @param name function name<a name="line.28"></a>
<span class="sourceLineNo">029</span>     * @param minArgs minimum number of arguments (inclusive)<a name="line.29"></a>
<span class="sourceLineNo">030</span>     * @param maxArgs maximum number of arguments (inclusive)<a name="line.30"></a>
<span class="sourceLineNo">031</span>     */<a name="line.31"></a>
<span class="sourceLineNo">032</span>    protected SimpleFunction(String name, int minArgs, int maxArgs) {<a name="line.32"></a>
<span class="sourceLineNo">033</span>        super(name);<a name="line.33"></a>
<span class="sourceLineNo">034</span>        if (minArgs &lt; 0 || minArgs &gt; maxArgs)<a name="line.34"></a>
<span class="sourceLineNo">035</span>            throw new IllegalArgumentException("invalid minArgs = " + minArgs + ", maxArgs = " + maxArgs);<a name="line.35"></a>
<span class="sourceLineNo">036</span>        this.minArgs = minArgs;<a name="line.36"></a>
<span class="sourceLineNo">037</span>        this.maxArgs = maxArgs;<a name="line.37"></a>
<span class="sourceLineNo">038</span>    }<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>// Accessors<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>    /**<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * Get the minimum number of arguments allowed (inclusive).<a name="line.43"></a>
<span class="sourceLineNo">044</span>     *<a name="line.44"></a>
<span class="sourceLineNo">045</span>     * @return minimum required function arguments<a name="line.45"></a>
<span class="sourceLineNo">046</span>     */<a name="line.46"></a>
<span class="sourceLineNo">047</span>    public int getMinArgs() {<a name="line.47"></a>
<span class="sourceLineNo">048</span>        return this.minArgs;<a name="line.48"></a>
<span class="sourceLineNo">049</span>    }<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span>    /**<a name="line.51"></a>
<span class="sourceLineNo">052</span>     * Get the maximum number of arguments allowed (inclusive).<a name="line.52"></a>
<span class="sourceLineNo">053</span>     *<a name="line.53"></a>
<span class="sourceLineNo">054</span>     * @return maximum allowed function arguments<a name="line.54"></a>
<span class="sourceLineNo">055</span>     */<a name="line.55"></a>
<span class="sourceLineNo">056</span>    public int getMaxArgs() {<a name="line.56"></a>
<span class="sourceLineNo">057</span>        return this.maxArgs;<a name="line.57"></a>
<span class="sourceLineNo">058</span>    }<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span>// Parsing<a name="line.60"></a>
<span class="sourceLineNo">061</span><a name="line.61"></a>
<span class="sourceLineNo">062</span>    @Override<a name="line.62"></a>
<span class="sourceLineNo">063</span>    public final Node[] parseParams(ParseSession session, ParseContext ctx, boolean complete) {<a name="line.63"></a>
<span class="sourceLineNo">064</span>        return this.parseExpressionParams(session, ctx, complete, 0, this.minArgs, this.maxArgs);<a name="line.64"></a>
<span class="sourceLineNo">065</span>    }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>    @Override<a name="line.67"></a>
<span class="sourceLineNo">068</span>    public final Value apply(ParseSession session, Object info) {<a name="line.68"></a>
<span class="sourceLineNo">069</span>        final Node[] params = (Node[])info;<a name="line.69"></a>
<span class="sourceLineNo">070</span>        final Value[] values = new Value[params.length];<a name="line.70"></a>
<span class="sourceLineNo">071</span>        for (int i = 0; i &lt; params.length; i++)<a name="line.71"></a>
<span class="sourceLineNo">072</span>            values[i] = params[i].evaluate(session);<a name="line.72"></a>
<span class="sourceLineNo">073</span>        return this.apply(session, values);<a name="line.73"></a>
<span class="sourceLineNo">074</span>    }<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span>    /**<a name="line.76"></a>
<span class="sourceLineNo">077</span>     * Apply this function to the given values.<a name="line.77"></a>
<span class="sourceLineNo">078</span>     *<a name="line.78"></a>
<span class="sourceLineNo">079</span>     * @param session parse session<a name="line.79"></a>
<span class="sourceLineNo">080</span>     * @param params parsed parameters; will already be checked between {@link #getMinArgs} and {@link #getMaxArgs}<a name="line.80"></a>
<span class="sourceLineNo">081</span>     * @return value returned by this function<a name="line.81"></a>
<span class="sourceLineNo">082</span>     * @throws RuntimeException if there is an error<a name="line.82"></a>
<span class="sourceLineNo">083</span>     */<a name="line.83"></a>
<span class="sourceLineNo">084</span>    protected abstract Value apply(ParseSession session, Value[] params);<a name="line.84"></a>
<span class="sourceLineNo">085</span>}<a name="line.85"></a>
<span class="sourceLineNo">086</span><a name="line.86"></a>




























































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